[英]How to assert two lists are not equivalent if in different order using Fluent Assertions
使用Fluent断言,我们可以使用以下方法断言两个集合是相等的(就属性值而言):
list1.ShouldBeEquivalentTo(list2);
假设list1
和list2
包含in any order
的相同对象,则断言为true。
如果我们要声明列表的顺序正确,我们可以执行以下操作:
list1.ShouldBeEquivalentTo(list2, o => o.WithStrictOrdering());
如果列表以wrong order
包含相同的对象,但是我找不到任何东西,我正在寻找断言为false的东西。
使用Fluent断言的最佳方法是什么?
PS-这是一种学术上的好奇心,在现实中甚至可能没有用:)
编辑 :现在,我了解了戴维的要求(请参阅下面的评论),我将代码更新为该解决方案。 尽管语法相似,但它不是FluentAssertion扩展,但可以通过一些操作来实现。
public static class IEnumerableAssertionExtensions
{
public static void ShouldContainInWrongOrder<TSubject>(this IEnumerable<TSubject> source, IEnumerable<TSubject> expected)
{
var remaining = expected.ToList();
var inOrder = true;
foreach (var subject in source)
{
if (inOrder && !ReferenceEquals(subject, remaining[0]))
{
inOrder = false;
}
var s = subject;
Execute.Verification.ForCondition(() => remaining.Remove(s)).FailWith("Expected item in the collection: {0}", subject.ToString());
}
Execute.Verification.ForCondition(() => remaining.Count == 0).FailWith(string.Format("{0} more item{1} than expected found in the list.", remaining.Count, ((remaining.Count == 1) ? string.Empty : "s")));
Execute.Verification.ForCondition(() => !inOrder).FailWith("list items are ordered identically");
}
}
[TestClass]
public class TestFoo
{
class Thing
{
public int i;
}
[TestMethod]
public void MyMethod()
{
var a1 = new Thing { i=0 };
var a2 = new Thing { i=1 };
var a3 = new Thing { i=2 };
var a4 = new Thing { i=2 };
var list1 = new List<Thing> { a1, a2, a3 };
var list2 = new List<Thing> { a1, a2, a3 };
var list3 = new List<Thing> { a3, a2, a1 };
var list4 = new List<Thing> { a1, a2, a3, a4 };
var list5 = new List<Thing> { a3, a2 };
list1.ShouldContainInWrongOrder(list3); // Succeeds
list1.ShouldContainInWrongOrder(list2); // Fails
list1.ShouldContainInWrongOrder(list4); // Fails
list1.ShouldContainInWrongOrder(list5); // Fails
}
}
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